Franz Pucher / Mbed 2 deprecated ESP8266_HTTP_MQTT_Server

M0 communication to configurable-Web-Server (MQTT) Version 0.1

Dependencies:   LM75B mbed

Siehe auch FTKL-Tagung 2016

main.cpp@3:c14eb9159a88, 2018-01-16 (annotated)

Committer:
fpucher
Date:
Tue Jan 16 13:34:44 2018 +0000
Revision:
3:c14eb9159a88
Parent:
2:63135b94c898 
M3-ESP8266-Communication

Who changed what in which revision?

UserRevisionLine numberNew contents of line
fpucher 3:c14eb9159a88 1 /************************************************************************
fpucher 3:c14eb9159a88 2 * Program : ESP8266_HTTP_MQTT_Server from _Arduino_Esp_Comm
fpucher 3:c14eb9159a88 3 * Descr. : M3-ESP8266-Communication similar to Arduino communication
fpucher 3:c14eb9159a88 4 * Input : Get data from Esp8266 from serial
fpucher 3:c14eb9159a88 5 * Process data (i.e. digital and analog channels)
fpucher 3:c14eb9159a88 6 ToDo: apply diffrent sensors over I2C, SPI, ...(i.e. LM75,...)
fpucher 3:c14eb9159a88 7 * Output : replay to Esp8266 over serial
fpucher 3:c14eb9159a88 8 ************************************************************************/
fpucher 3:c14eb9159a88 9
fpucher 2:63135b94c898 10 #include "mbed.h"
fpucher 2:63135b94c898 11 #include <stdio.h>
fpucher 2:63135b94c898 12 #include <string>
fpucher 0:d764cafa5989 13
fpucher 1:b9fd13f34c2d 14 DigitalOut LedD1(LED1);
fpucher 1:b9fd13f34c2d 15 DigitalOut LedD2(LED2);
fpucher 1:b9fd13f34c2d 16 DigitalOut LedD3(LED3);
fpucher 1:b9fd13f34c2d 17 DigitalOut LedD4(LED4);
fpucher 3:c14eb9159a88 18 BusOut ledbus(LED1, LED2, LED3, LED4);
fpucher 2:63135b94c898 19 AnalogIn poti1(p19);
fpucher 2:63135b94c898 20 AnalogIn poti2(p20);
fpucher 2:63135b94c898 21
fpucher 3:c14eb9159a88 22 Serial wifi(p9, p10); // M0, M3, (P1_0, P0_20) Bertl
fpucher 0:d764cafa5989 23 Serial pc(USBTX, USBRX);
fpucher 2:63135b94c898 24 char recChar=0;
fpucher 2:63135b94c898 25 bool recFlag=false;
fpucher 0:d764cafa5989 26
fpucher 2:63135b94c898 27 string fromEsp8266 = "";
fpucher 2:63135b94c898 28 string toEsp8266 = "";
fpucher 2:63135b94c898 29 string periodicMsg="";
fpucher 2:63135b94c898 30 long lastMsg = 0;
fpucher 2:63135b94c898 31 int url_decode(char *encoded_str, char *decoded_str);
fpucher 0:d764cafa5989 32
fpucher 3:c14eb9159a88 33 string getPoti(char potiNo)
fpucher 3:c14eb9159a88 34 {
fpucher 2:63135b94c898 35 char pValStr[20] = "ME-01";
fpucher 2:63135b94c898 36 int n=-1;
fpucher 2:63135b94c898 37 // pc.printf("Poti %c selected\r\n", potiNo);
fpucher 3:c14eb9159a88 38 if (potiNo == 1)
fpucher 3:c14eb9159a88 39 n = sprintf(pValStr, "%d", poti1.read_u16());
fpucher 3:c14eb9159a88 40 else if (potiNo == 2)
fpucher 3:c14eb9159a88 41 n = sprintf(pValStr, "%d", poti2.read_u16());
fpucher 2:63135b94c898 42 if (n<=0)
fpucher 3:c14eb9159a88 43 sprintf(pValStr, "ME01");
fpucher 3:c14eb9159a88 44
fpucher 2:63135b94c898 45 pc.printf("Wert von Poti %c: %s\r\n", potiNo, pValStr);
fpucher 2:63135b94c898 46 return pValStr;
fpucher 3:c14eb9159a88 47 }
fpucher 0:d764cafa5989 48
fpucher 3:c14eb9159a88 49 /********************************************************
fpucher 3:c14eb9159a88 50 * Process Requests from ESP8266
fpucher 3:c14eb9159a88 51 * Input: global string fromEsp8266
fpucher 3:c14eb9159a88 52 ********************************************************/
fpucher 3:c14eb9159a88 53 void ProcessRequests()
fpucher 3:c14eb9159a88 54 {
fpucher 2:63135b94c898 55 int chan,state,button;
fpucher 2:63135b94c898 56 float Ain;
fpucher 2:63135b94c898 57 char szAin[20],szT[200];
fpucher 2:63135b94c898 58 string poti;
fpucher 3:c14eb9159a88 59
fpucher 3:c14eb9159a88 60 // process string if end of line
fpucher 3:c14eb9159a88 61 if(fromEsp8266.substr(0,8)=="Arduino_") { // Valid command from ESP8266?
fpucher 3:c14eb9159a88 62 if(fromEsp8266.substr(8,2) == "SM") { // Set Digital if true
fpucher 3:c14eb9159a88 63 // --- Build Reply String -----------------------------------------------
fpucher 3:c14eb9159a88 64 toEsp8266 = "Echoing your message: ";
fpucher 3:c14eb9159a88 65 toEsp8266 += fromEsp8266.substr(10,50);
fpucher 3:c14eb9159a88 66 wifi.printf("%s\n", toEsp8266);
fpucher 3:c14eb9159a88 67 // ---- Set Periodic Message String -------------------------------------
fpucher 3:c14eb9159a88 68 url_decode((char *)toEsp8266.c_str(), (char *)szT );
fpucher 3:c14eb9159a88 69 periodicMsg = szT;
fpucher 3:c14eb9159a88 70 } else if(fromEsp8266.substr(8,2) == "SD") { // Set Digital if true
fpucher 3:c14eb9159a88 71 // --- Build Reply String -----------------------------------------------
fpucher 3:c14eb9159a88 72 toEsp8266 = "Digital Channel ";
fpucher 3:c14eb9159a88 73 toEsp8266 += fromEsp8266.substr(10,2); //Digital Channel
fpucher 3:c14eb9159a88 74 toEsp8266 += " is ";
fpucher 3:c14eb9159a88 75 toEsp8266 += (fromEsp8266.substr(12,1)=="0") ? "LO" : "HI";
fpucher 3:c14eb9159a88 76 // ---- Send Reply String -----------------------------------------------
fpucher 3:c14eb9159a88 77 wifi.printf("%s\n", toEsp8266); // Send Reply String to Console
fpucher 3:c14eb9159a88 78 // --- Set Digital Channel State ----------------------------------------
fpucher 3:c14eb9159a88 79 chan = atoi(fromEsp8266.substr(10,2).c_str());
fpucher 3:c14eb9159a88 80 state = atoi(fromEsp8266.substr(12,1).c_str());
fpucher 3:c14eb9159a88 81 ledbus[chan-1] = state; // Set Digital Output per request
fpucher 3:c14eb9159a88 82
fpucher 3:c14eb9159a88 83 } else if(fromEsp8266.substr(8,2) == "GD") { // Get Digital if true
fpucher 3:c14eb9159a88 84 // --- Get Digital Channel State ----------------------------------------
fpucher 3:c14eb9159a88 85 chan = atoi(fromEsp8266.substr(10,2).c_str());
fpucher 3:c14eb9159a88 86 state = LedD4.read(); // Set Digital Output per request
fpucher 3:c14eb9159a88 87 // --- Build Reply String -----------------------------------------------
fpucher 3:c14eb9159a88 88 toEsp8266 = "Digital Channel ";
fpucher 3:c14eb9159a88 89 toEsp8266 += fromEsp8266.substr(10,2); // Digital Channel
fpucher 3:c14eb9159a88 90 toEsp8266 += " is ";
fpucher 3:c14eb9159a88 91 toEsp8266 += (state==0) ? "LO" : "HI";
fpucher 3:c14eb9159a88 92 // ---- Send Reply String -----------------------------------------------
fpucher 3:c14eb9159a88 93 wifi.printf("%s\n",toEsp8266); // Send Reply String to ESP
fpucher 3:c14eb9159a88 94 } else if(fromEsp8266.substr(8,2) == "GA") { // Get Analog if true
fpucher 3:c14eb9159a88 95 // --- Get Analog Channel Reading ---------------------------------------
fpucher 3:c14eb9159a88 96 chan = atoi(fromEsp8266.substr(10,2).c_str());
fpucher 3:c14eb9159a88 97 //Ain = 0.0048828 * (float) analogRead(chan); // Read analog input
fpucher 3:c14eb9159a88 98 //ftoa(Ain,szAin, 2);
fpucher 3:c14eb9159a88 99 poti = getPoti(chan);
fpucher 3:c14eb9159a88 100 // --- Build Reply String -----------------------------------------------
fpucher 3:c14eb9159a88 101 toEsp8266 = "Poti ";
fpucher 3:c14eb9159a88 102 toEsp8266 += fromEsp8266.substr(10,2); //Analog Channel
fpucher 3:c14eb9159a88 103 toEsp8266 += " is ";
fpucher 3:c14eb9159a88 104 toEsp8266 += poti; //string(szAin);
fpucher 3:c14eb9159a88 105 // ---- Send Reply String -----------------------------------------------
fpucher 3:c14eb9159a88 106 wifi.printf("%s\n",toEsp8266); // Send Reply String to ESP
fpucher 3:c14eb9159a88 107 } else {
fpucher 3:c14eb9159a88 108 // ---- Send Reply String -----------------------------------------------
fpucher 3:c14eb9159a88 109 toEsp8266 = "Arduino does not recognize request.";
fpucher 3:c14eb9159a88 110 //pc.printf("%s\n", toEsp8266); // Send Reply String to Console
fpucher 3:c14eb9159a88 111 wifi.printf("%s\n", toEsp8266); // Send Reply String to ESP
fpucher 3:c14eb9159a88 112 }
fpucher 3:c14eb9159a88 113 }
fpucher 3:c14eb9159a88 114 fromEsp8266 = "";
fpucher 3:c14eb9159a88 115 //toEspSerial.flush();
fpucher 2:63135b94c898 116 }
fpucher 2:63135b94c898 117
fpucher 2:63135b94c898 118 /********************************************************
fpucher 2:63135b94c898 119 * URL Message Decoder
fpucher 2:63135b94c898 120 ********************************************************/
fpucher 3:c14eb9159a88 121 int url_decode(char *encoded_str, char *decoded_str)
fpucher 3:c14eb9159a88 122 {
fpucher 2:63135b94c898 123 // While we're not at the end of the string (current character not NULL)
fpucher 2:63135b94c898 124 while (*encoded_str) {
fpucher 2:63135b94c898 125 // Check to see if the current character is a %
fpucher 2:63135b94c898 126 if (*encoded_str == '%') {
fpucher 3:c14eb9159a88 127
fpucher 2:63135b94c898 128 // Grab the next two characters and move encoded_str forwards
fpucher 2:63135b94c898 129 encoded_str++;
fpucher 2:63135b94c898 130 char high = *encoded_str;
fpucher 2:63135b94c898 131 encoded_str++;
fpucher 2:63135b94c898 132 char low = *encoded_str;
fpucher 3:c14eb9159a88 133
fpucher 2:63135b94c898 134 // Convert ASCII 0-9A-F to a value 0-15
fpucher 2:63135b94c898 135 if (high > 0x39) high -= 7;
fpucher 2:63135b94c898 136 high &= 0x0f;
fpucher 3:c14eb9159a88 137
fpucher 2:63135b94c898 138 // Same again for the low byte:
fpucher 2:63135b94c898 139 if (low > 0x39) low -= 7;
fpucher 2:63135b94c898 140 low &= 0x0f;
fpucher 3:c14eb9159a88 141
fpucher 2:63135b94c898 142 // Combine the two into a single byte and store in decoded_str:
fpucher 2:63135b94c898 143 *decoded_str = (high << 4) | low;
fpucher 2:63135b94c898 144 } else {
fpucher 2:63135b94c898 145 // All other characters copy verbatim
fpucher 2:63135b94c898 146 *decoded_str = *encoded_str;
fpucher 0:d764cafa5989 147 }
fpucher 3:c14eb9159a88 148
fpucher 2:63135b94c898 149 // Move both pointers to the next character:
fpucher 2:63135b94c898 150 encoded_str++;
fpucher 2:63135b94c898 151 decoded_str++;
fpucher 2:63135b94c898 152 }
fpucher 2:63135b94c898 153 // Terminate the new string with a NULL character to trim it off
fpucher 2:63135b94c898 154 *decoded_str = 0;
fpucher 2:63135b94c898 155 return 0;
fpucher 2:63135b94c898 156 }
fpucher 3:c14eb9159a88 157
fpucher 3:c14eb9159a88 158 void flushSerialBuffer()
fpucher 3:c14eb9159a88 159 {
fpucher 3:c14eb9159a88 160 while (wifi.readable()) {
fpucher 3:c14eb9159a88 161 wifi.getc();
fpucher 3:c14eb9159a88 162 }
fpucher 2:63135b94c898 163 }
fpucher 2:63135b94c898 164
fpucher 3:c14eb9159a88 165 /********************************************************
fpucher 3:c14eb9159a88 166 * ISR readData and stored in global fromEsp8266 string
fpucher 3:c14eb9159a88 167 ********************************************************/
fpucher 2:63135b94c898 168 bool semi = false;
fpucher 3:c14eb9159a88 169 bool blank = false;
fpucher 3:c14eb9159a88 170
fpucher 3:c14eb9159a88 171 void readData()
fpucher 3:c14eb9159a88 172 {
fpucher 2:63135b94c898 173 recChar = wifi.getc();
fpucher 2:63135b94c898 174 if (recChar != '\n') {
fpucher 2:63135b94c898 175 if(recChar != ':') semi = true;
fpucher 2:63135b94c898 176 if(semi && (recChar != ' ')) blank = true;
fpucher 2:63135b94c898 177 if(semi && blank)
fpucher 3:c14eb9159a88 178 fromEsp8266 += recChar; // add it to receive string
fpucher 3:c14eb9159a88 179 } else {
fpucher 3:c14eb9159a88 180 recFlag = true;
fpucher 3:c14eb9159a88 181 semi = false;
fpucher 3:c14eb9159a88 182 blank = false;
fpucher 2:63135b94c898 183 flushSerialBuffer();
fpucher 2:63135b94c898 184 }
fpucher 2:63135b94c898 185 }
fpucher 3:c14eb9159a88 186
fpucher 3:c14eb9159a88 187 int main()
fpucher 3:c14eb9159a88 188 {
fpucher 2:63135b94c898 189 pc.baud(115200);
fpucher 2:63135b94c898 190 wifi.baud(115200);
fpucher 2:63135b94c898 191 pc.printf("\f\n\r-------------ESP8266 Arduino -------------\n\r");
fpucher 2:63135b94c898 192 wifi.attach(&readData);
fpucher 2:63135b94c898 193 while(1) {
fpucher 2:63135b94c898 194 if(recFlag) {
fpucher 3:c14eb9159a88 195 pc.printf("readData: %s\n", fromEsp8266);
fpucher 3:c14eb9159a88 196 ProcessRequests();
fpucher 2:63135b94c898 197 recFlag=false;
fpucher 2:63135b94c898 198 }
fpucher 2:63135b94c898 199 LedD1 = 1;
fpucher 2:63135b94c898 200 wait(0.2);
fpucher 2:63135b94c898 201 LedD1 = 0;
fpucher 2:63135b94c898 202 wait(0.2);
fpucher 2:63135b94c898 203 }
fpucher 2:63135b94c898 204 }